[OSPP 2025] Kmesh-daemon upgrades traffic without disruption

[LiZhenCheng9527]

Kmesh is a high-performance and low overhead service mesh data plane based on eBPF and programmable kernel. Kmesh-Damon, acts as a hypervisor for the usespace and is responsible for communicating with the control plane and sending down the configuration of the Kmesh. In the previous version of Kmesh, it has been realized that kmesh-daemon restarts without breaking the established links, and is also able to govern the traffic according to the previous policy. Now we would like to cover the Kmesh-daemon upgrade scenario with this convenient feature. When Kmesh-daemon is upgraded, the traffic can be managed without interruption. The bottleneck is how to compare the structure of the bpf map before and after the upgrade.

[LiZhenCheng9527]

OUTOUT

1. function code
   1.1. bpf map structure comparison code
   1.2. Method of determining the upgrade
2. Document
   2.1. proposal
   2.2. userguide
3. Test Code
   3.1. Unit test for main functional functions
   3.2. E2E test of feature